knight



2 Sheets-Sheet 1.

No Model.) I

J. 0. KNIGHT.

ELECTRIC ARC LAMP. 4

Patented July 14, 1896! (No Model.) v 2 Si1.uL--Sh891; 2

J. C. KNIGHT. ELECTRIC ARG LAMP.

Patented. July 14,1896

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ihviiien SPECIFICATiON fdn'iiin' g STATES? 13mm eriNi-eiii, @F mm New I JERSEY.

part of Letters Patent No. 563,773, dated July 14 1896.

I A plication filed November 21,1895, Seriril No. 569,688. (No model.)

072 0122 it may coziccrrt: mown that 1, JOHN (J, KNIGH'L'Q citizcn oi"; the la iiitcd States, residing at Roselle,

i11the'coniityof Union and State of New Jeritnventcd. certain new and useful lmprcw emenl's in Ai'cellaimps, of which the 'i'ollowin'g a specification, reference being ,l'mdl-herein'to the accompanying drcwings.

M y invention relates to that class of arclmiipsdowhich the carbon feeding' mechanism iscontrolledibye shunt-magnet 0pereting -iu 'corlnectionwvith on armature the po sition of which controls; a friction device or wheel geared to the upper carb on irod; and thea p'rincipal'object of m'y" invention to ohezipen-t-llo construction and improve the cf-licioncy of thefemliiig mechanism of this clziss of lamps.

)jlyi'nventimialso includes an improved cuti-out devicecoinprisingltwo parts, one (or both) oii' which is perii'm-ncntl magi] etized, and one of which iscarried by the upper or is'ii'eut-orit lover or switch to heoperated to open th coimn -(l' dc tachaihle [have also provided an improved stoning device for the globe- Inthc drmvings, lligure I'iSuSGCilOilZLl ele- VHil lOIL efzi'lzinip embodying my invention. Fig-"i ls a plz'in VlGW oi, the globediolder to shoW'itS cletaclizilol e connection. with the love r rods"-oh'thiilamp-frame, Fig. 3 is a detach able wiciv,"oil :1" larger scale thenltigsi 1 and 2, oi' 'onc ot' the globe-hold(air-connecting de vices?- 'l i'; d :1; sectional elevation taken at right or Josie thcposiiion shown in Fig 1: i: :LflOlfiil view ml at larger scale other figures, to show the cutout otherend oi which is connected toan :Lrnutturo F3 having corepicces c extending within 11000 ifii shlint-ma g iet i TllGZll'lllZl-hlllG E is Sweeney heavy =-.to"fovcrlmlance the SMGSS of the springs; (Z. f

whorl-rod and the other'o'f which circuit when the carbon has been lug rod ll, having nv Below theerniaiture E is a sl1ort-wonnd and. therefore relatively Weak electromagnet G, having pole-pieces g, and which, as will be hereinafter exphiined, serves as fpielo'up to lift the upper carbon rod or carrier to form the are When the current is first turned onand the lamp is first light-ed, this picleup magnet being normally, or when the lamp is burning, entirely disconnected from the carhon-feeding mechanism and thus being ,entirely idle after it has performed its fiiiietion of lifting the upper carbon. to form theme.

Attached to the upper end of the carbonrod B a permanent magnet Zfle portion of which is extended ietemlly tromlsaid rod, so as to be above the free end of a pivoted cutout lever orsivitch h, which free end normally rests on a contact pin or block beneath it and with which contact pin or block the conduct-or 7, forming part of the shunt-circuit, is in electrical connection.

Instead of making the part b" t permanent magnet the cut-out lever or switch h may be permanently magnetized, and the part b'will then serve as an attraction-piece, or the parts I) and It may both he magnetized by opposite pole nzigiiots, so that they will attract each other.

Attached to the upper ends of the rods A, which support the lowercarbon. holder B, are sleeves i, provided with notched lugs 2' to engage with inwardly extcnding lugs or armsj v on the globeholder By lifting the globehoider to disengage the h1g5 or arms j from the notched lugs 21, and then by partially ro iatin said globe-holder to i nore the said arms or lugs j out of the vertical planes of thelugs '1 the globe-holder will he relemeed, so that it may hold ropped down and removed from the lamp when. ales d.

The main or ent enters the lamp at the positive bindin post 2, pz-issing thence vth rough c nductor 3 pick-up i'nngnet- G, conductor -fi, lamp-frame 1-, and carbon rod or doctor 5 :ind negative bimiling-poi (3". "ihe smelt-current passes" from the lamp-frame through cut-out; switch erlevrr 7b, conductor I 7, shunt-nmgiict coils F, and conductors to negative binding-post The open-11km. of my lamp is follows: fWhcnthe cu rrent ie first turned on, (the carbons bein get sei'ch ti me scrim-atoll 7 so IOC that the."

current cannot pass through them,) the full strength thereof is passed through the shuntmagnet F, thereby so fully energizing the latter as to suddenly lift the armature E into contact with said magnet, thus lowering the end of the chain c, which is connected with the spring (I, so that the free or movable end of said spring rests on the stop or post on, thereby slackening the said ehain a-nd releasing its frictional hold on the wheel or pulley U to such an extent that the carbon-rod B will fall ,l'iygravity until. the earbonsare-in ed11 tact.

bons the are is widened sulliciently to cause resistance enough to divert a portion of the;

rurrentto the shunt-circuit,when the increasing power of the shunt-magnet will lift the armature E to or near feeding position,wl1ere it will be practicallyout of the magnetic field of the relatively weak short-wound magnet ii, and the latter will now h entirely idle while the lamp is burning, said magnet G harin g normally no connection with the feeding mechanism. The lamp will nowcoutin-ue to burn in the usual manner until, by the gradual consumption of the carbons, the carhon-rod 13 has so far descended that the permanen t magnet 7) comes near enough to lift the cut-out lover or switch It, and thus break the shunt-circu it, permitting the armature E to fall, so that the carbon-feeding mechanism is remlcred inoperative, and as the carbons now burn away and become widely separated the passage of the current is entirelysuspended.

The steady holding down of the ari'naturo E by the magi'ict (l prevents said magnet from dancing or jumping at the time of ihefirst formation of ijheelectric arc and before the normal burning conditions oi. the lam p are es tablished, and thus this comparatively cheap shortmvound magnet as effectively prevents all flickering of the lamp as the more cx pensive long-wound coil or relay magnets heretofore employed for this purpose in dill'crcn- 'tial lamps, while at the time insuring a. longgor and more stablearethnn is secured in a shuntlamp when ii rst lighted, thus avoiding llickerint, of light and waste of current.

Having thus described. my invention, I claim and desire to secure by Letters latent- 1. In an 'Jl() 'll'l(7-lll'(: lamp, the combination with a movable calbon-rod and a l'eeding mechanism therefor, o! a shunt-magnet and an armature for controlling said feeding mechanism, and a SllOllJ-WOlllHl pick-up magnet in the main circuit, said armature being normally practically outside of the field of c'ityfiedearbon-rod B, the wheel or pulley having a geared connection with sa d red, the friction-chain a passing over said wheel, a

spring to which one end of said chain is connected, the armature'l l to which the other end of said chain is connected and which is provided with the core-pins e, the shunt-magnet F within the coils of which said eore-pieees extend and the short-wound pick-up magnet G connected in the main circuit and arranged below the said armature, the latter, when in feeding position, being practically out of the magnetic field of said armature G. 3. In an electric-arc lamp, the cmnbinatioi with a movable carbon -rod and a feeding mechanism therefor, of a shunt-magnet and armature for controlling said feeding mechanism, and a cut-out device for said shuntmagnet comprising a metallic piece carried by said carbon-rod and a movable cut-out switch or lever, one 01' both parts of said cutout device being permanently magnetized.

4. In an electric-arc lamp, the combination with tiie movable carbon-rod]! provided with the permanent magnet h, of the cut-out lover or switch hin the shunt-circuit, the feeding mechanism furs-aid carbon-rod and the shuntmaguet and armature for controlling said feeding mechanism.

in an electric-arc lamp, a movable carbonrod and a feeding mechanism therefor comprising'a shunt-circuit, a shunt-1nnguct, a spring, and an armature with which said spring is connected so as to have atenden'cy to lift said armature toward the said sh nut-mag not, said armature however being sn llieicntly heavy to ovcrbalaucc the stress ot'said spring, combined with a short-wound pick-up magnet connected in the main circuit, said armature being normally practically outside of the iii-id of said pick-up magnet, and the latter being arranged below said armature so as to act 10 hold the same down steadily when the main portion of the current is passing through the main circuit, and before the shunt-nmgnet becomes sufficiently energized in properly control the said armature, substantially as and for the purpose set forth.

In testimony whereof I allix my signature in presence of two witnesses. 

